Background information: Ocean creatures that live in the deep ocean where there is no light often carry a light source of their own. Sometimes, they have special cells that can make light the way fireflies do. Just as often, the light comes from bacteria that live in and on the sea creatures. For example, the flashlight fish has light spots beneath its eyes. These spots are home to millions of luminescent bacteria. The bacteria get nourishment from the fish and the fish gets to have light. Light is important for catching food. Also, light can aid in confusing larger predators.